They do work though. Typically a board like /g/ is on topic and containment boards are used to shame offtopic users. That might sound unconvincing and "a state

They do work though. Typically a board like /g/ is on topic and containment boards are used to shame offtopic users. That might sound unconvincing and "a state of mind" but social dynamics do work. If there is 1 /pol// shitposter in a thread they will be called out as bait or told to go back to their containment board. It's a useful rhetorical tool on 4chan and it works better than any literal rule because it comes organically from the board's culture.